[amsat-bb] Re: Digital QRM on FO-29 (DF opportunity!)

[Stefan Wagener]

At one point, folks were using PSK31 on FO-29.

Check the waterfall and see how it looks like :-)

Stefan, VE4NSA


On Sat, Oct 5, 2013 at 8:25 AM, Robert Bruninga <bruninga at usna.edu> wrote:

> Wow, a GREAT DF opportunity and exercise.  The Doppler info is there
> to determine its location.  Just plot the doppler and note the center
> point and draw a line of bearing through it.  Combine with others and
> find the source.
>
> heh heh... though, complicated by having to subtract out your own...
> But we should develop these techniques.  They are the basis of all of
> the original Search And Rescue satellite systems.
>
> In fact!!!  Why not get a few hams in a few areas of the country to
> operate a CW carrier (at low power) at a known frequency in 4 corners
> of the US and let evreyone practice their techniques.  This way, we
> learn how to do it on a known signal.
>
> Just a thought.
>
> Bob, WB4APR
>
> On Fri, Oct 4, 2013 at 4:51 PM, Paul Stoetzer <n8hm at arrl.net> wrote:
> > During two passes of FO-29 - at around 0120Z last night and around 1430Z
> > this morning, I've heard some QRM that sounds like a digital signal. I
> > confirmed that others heard it too and it wasn't local QRM, so it's
> > obviously being relayed by the satellite. Downlink is around 435.860 MHz
> (I
> > heard it around 435.865 last night as the satellite was approaching and
> > around 435.855 MHz this morning as the satellite was moving away), so the
> > signal is likely being transmitted around 145.940 MHz.
> >
> > Has anybody else heard it? Any ideas on what the source might be?
> >
> > 73,
> >
> > Paul Stoetzer, N8HM
> > Washington, DC
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